133311421 has 4 divisors (see below), whose sum is σ = 133344000. Its totient is φ = 133278844.

The previous prime is 133311403. The next prime is 133311457. The reversal of 133311421 is 124113331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133311421 - 2⁵ = 133311389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133311401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091 + ... + 18688.

It is an arithmetic number, because the mean of its divisors is an integer number (33336000).

Almost surely, 2^133311421 is an apocalyptic number.

It is an amenable number.

133311421 is a deficient number, since it is larger than the sum of its proper divisors (32579).

133311421 is an equidigital number, since it uses as much as digits as its factorization.

133311421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32578.

The product of its digits is 216, while the sum is 19.

The square root of 133311421 is about 11546.0565129398. The cubic root of 133311421 is about 510.8449673496.

Adding to 133311421 its reverse (124113331), we get a palindrome (257424752).

The spelling of 133311421 in words is "one hundred thirty-three million, three hundred eleven thousand, four hundred twenty-one".